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RFC 1905 - 3. Definitions

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### 3. Definitions

         SNMPv2-PDU DEFINITIONS ::= BEGIN

         IMPORTS
             ObjectName, ObjectSyntax, Integer32
                 FROM SNMPv2-SMI;

         -- protocol data units

         PDUs ::=
             CHOICE {
                 get-request
                     GetRequest-PDU,

                 get-next-request
                     GetNextRequest-PDU,

                 get-bulk-request
                     GetBulkRequest-PDU,

                 response
                     Response-PDU,

                 set-request
                     SetRequest-PDU,

                 inform-request
                     InformRequest-PDU,

                 snmpV2-trap
                     SNMPv2-Trap-PDU,

                 report
                     Report-PDU,
             }

         -- PDUs

         GetRequest-PDU ::=
             [0]
                 IMPLICIT PDU

         GetNextRequest-PDU ::=
             [1]
                 IMPLICIT PDU

         Response-PDU ::=
             [2]
                 IMPLICIT PDU

         SetRequest-PDU ::=
             [3]
                 IMPLICIT PDU

         -- [4] is obsolete

         GetBulkRequest-PDU ::=
             [5]
                 IMPLICIT BulkPDU

         InformRequest-PDU ::=
             [6]
                 IMPLICIT PDU

         SNMPv2-Trap-PDU ::=
             [7]
                 IMPLICIT PDU

         --   Usage and precise semantics of Report-PDU are not presently
         --   defined.  Any SNMP administrative framework making use of
         --   this PDU must define its usage and semantics.
         Report-PDU ::=
             [8]
                 IMPLICIT PDU

         max-bindings
             INTEGER ::= 2147483647

         PDU ::=
             SEQUENCE {
                 request-id
                     Integer32,

                 error-status            -- sometimes ignored
                     INTEGER {
                         noError(0),
                         tooBig(1),
                         noSuchName(2),   -- for proxy compatibility
                         badValue(3),     -- for proxy compatibility
                         readOnly(4),     -- for proxy compatibility
                         genErr(5),
                         noAccess(6),
                         wrongType(7),
                         wrongLength(8),
                         wrongEncoding(9),
                         wrongValue(10),
                         noCreation(11),
                         inconsistentValue(12),
                         resourceUnavailable(13),
                         commitFailed(14),
                         undoFailed(15),
                         authorizationError(16),
                         notWritable(17),
                         inconsistentName(18)
                     },

                 error-index            -- sometimes ignored
                     INTEGER (0..max-bindings),

                 variable-bindings   -- values are sometimes ignored
                     VarBindList
             }

         BulkPDU ::=                     -- MUST be identical in
             SEQUENCE {                  -- structure to PDU
                 request-id
                     Integer32,

                 non-repeaters
                     INTEGER (0..max-bindings),

                 max-repetitions
                     INTEGER (0..max-bindings),

                 variable-bindings       -- values are ignored
                     VarBindList
             }

         -- variable binding

         VarBind ::=
             SEQUENCE {
                 name
                     ObjectName,

                 CHOICE {
                     value
                         ObjectSyntax,

                     unSpecified         -- in retrieval requests
                             NULL,

                                         -- exceptions in responses
                     noSuchObject[0]
                             IMPLICIT NULL,

                     noSuchInstance[1]
                             IMPLICIT NULL,

                     endOfMibView[2]
                             IMPLICIT NULL
                 }
             }

         -- variable-binding list

         VarBindList ::=
             SEQUENCE (SIZE (0..max-bindings)) OF
                 VarBind

         END

Next: 4. Protocol Specification

Connected: An Internet Encyclopedia
RFC 1905 - 3. Definitions